Этот словарь прекрасно подходит для тех, кто хочет писать точнее.

Because словарь is the subject of the sentence, so it is in the nominative case.

• этот = this
• словарь = dictionary

The noun словарь is masculine singular, so the demonstrative must match it:

• этот словарь = this dictionary

You would only see other forms if the noun had a different role in the sentence, for example:

• нет этого словаря = there is no this dictionary / no copy of this dictionary (genitive)
• я вижу этот словарь = I see this dictionary (accusative, same form here as nominative because it is inanimate)

Here подходит means is suitable, is well suited, or works well.

The verb is подходить, which often means:

• to suit
• to fit
• to be appropriate

So:

• Этот словарь прекрасно подходит... = This dictionary is perfectly well suited...

A very literal idea is something like comes up well for or fits well for, but in natural English is ideal/suitable is better.

Прекрасно is an adverb here. It describes how the dictionary suits the purpose.

• прекрасный = wonderful / excellent (adjective)
• прекрасно = wonderfully / excellently / perfectly (adverb)

So:

• прекрасный словарь = an excellent dictionary
• словарь прекрасно подходит = the dictionary suits the purpose perfectly

In this sentence, прекрасно modifies the verb подходит, not the noun словарь.

Because the preposition для requires the genitive case.

The basic pronoun is:

• те = those

But after для, it changes to the genitive plural:

• для тех = for those

So:

• для тех = for those
• для тех, кто... = for those who...

This is a very common pattern in Russian.

Because кто is commonly used after words like тот, те, все, каждый when you mean the person/people who...

So:

• те, кто хочет... = those who want...

This is more natural in Russian than using которые here.

Compare:

• те, кто хочет писать точнее = those who want to write more precisely
• люди, которые хотят писать точнее = people who want to write more precisely

Both are possible in the right context, but with те the usual continuation is кто, not которые.

Also note that the verb after кто is usually singular:

• те, кто хочет...

not usually:

• те, кто хотят...

This is a very common point of confusion.

Although тех is plural (those), the relative pronoun кто is treated grammatically as singular in this kind of construction, so the verb is usually singular too:

• те, кто хочет
• literally: those who wants
• naturally in English: those who want

This is normal Russian grammar.

You will sometimes hear variation in speech, but for learners the safest standard pattern is:

• те, кто хочет
• все, кто знает
• каждый, кто видит

Because the sentence is talking about a general activity or ongoing skill, not one completed result.

• писать = imperfective = to write
• написать = perfective = to write something and finish it

Here the idea is:

• people who want to write more precisely

That means they want to improve their writing in general, so писать is the natural choice.

If you used написать, it would suggest completing a specific piece of writing more precisely, which is not the main idea here.

Точнее is the comparative form of точно.

• точно = precisely / accurately
• точнее = more precisely / more accurately

So:

• писать точнее = to write more precisely

This does not necessarily mean comparing two specific things directly. In Russian, the comparative is often used in a broad sense meaning better, with more precision.

Because in Russian, comparatives are usually formed directly in one word.

English:

• precisely → more precisely

Russian:

• точно → точнее

So Russian does not need a separate word like more here.

Some more examples:

• быстро → быстрее = faster
• ясно → яснее = more clearly
• кратко → короче = more briefly

Here it is an adverb, because it describes the verb писать.

It answers the question how to write?

• писать как? → точнее

Compare:

• точный ответ = a precise answer — adjective
• ответить точнее = to answer more precisely — adverb

Yes, that is a very direct and accurate translation of the structure.

• для = for
• тех = those (genitive after для)
• кто хочет = who want(s)

So the whole phrase literally matches English very closely:

• для тех, кто хочет писать точнее
• for those who want to write more precisely

Yes, Russian word order is flexible, but the original order is natural and neutral.

Standard version:

• Этот словарь прекрасно подходит для тех, кто хочет писать точнее.

You might also hear:

• Для тех, кто хочет писать точнее, этот словарь прекрасно подходит.

This version emphasizes for those who want to write more precisely.

Russian often changes word order for emphasis, topic, or style, but the original sentence is a very normal default way to say it.

Because кто хочет писать точнее is a subordinate clause attached to тех.

Russian punctuation requires a comma before clauses introduced by words like:

• кто = who
• что = that/what
• когда = when
• если = if

So:

• для тех, кто хочет писать точнее

is punctuated with a comma just as English often uses one in a similar structure.

Yes. Подходит simply means suits / is suitable. Adding прекрасно makes it stronger:

• подходит = is suitable
• хорошо подходит = is well suited
• прекрасно подходит = is excellently/perfectly suited

So the sentence is not just saying the dictionary is acceptable; it is saying it is a very good match for that purpose.