Rileggendo il tema, trovo un sinonimo più semplice per una parola difficile.

Rileggendo is the gerund of rileggere, which means to reread.

It is formed from:

• ri- = again
• leggere = to read

So:

• leggere → leggendo = reading
• rileggere → rileggendo = rereading / while rereading

In this sentence, rileggendo il tema means something like while rereading the essay.

Italian often uses the gerund to express an action happening at the same time as another action.

So:

• Rileggendo il tema, trovo... literally means
• While rereading the essay, I find...

A fuller version such as quando rileggo il tema is also possible, but rileggendo is more compact and very natural.

The gerund here tells you that the action of rereading and the action of finding happen together.

Yes, normally it does.

In a sentence like:

• Rileggendo il tema, trovo...

the understood subject of rileggendo is the same as the subject of trovo, namely I.

So the sentence means:

• While I am rereading the essay, I find...

Italian usually expects the gerund to refer to the same subject as the main verb unless the sentence is clearly reworded in another way.

Because Italian usually omits subject pronouns when they are already clear from the verb ending.

• trovo = I find
• trovi = you find
• trova = he/she finds

Since -o already tells you the subject is I, io is not necessary.

You could say io trovo, but that would usually add emphasis or contrast:

• Io trovo un sinonimo... = I find a synonym...

In this context, tema usually means school essay, composition, or written assignment, not theme in the English abstract sense.

So:

• il tema = the essay / the composition

This is a very common school-related meaning of tema in Italian.

Both are grammatically possible, but they are not equally natural in everyday Italian.

• un sinonimo più semplice = the most normal, neutral way to say it
• un più semplice sinonimo = more literary or stylistically marked

In Italian, descriptive adjectives often come after the noun, especially in ordinary speech:

• una parola difficile
• un sinonimo semplice

When you add più, it is still very natural to keep the adjective after the noun:

• un sinonimo più semplice = a simpler synonym

Because semplice here is an adjective describing the noun sinonimo.

• un sinonimo più semplice = a simpler synonym

If you used semplicemente, that would be an adverb, meaning simply, and it would describe a verb, not a noun.

So:

• semplice = simple
• semplicemente = simply

Here we need the adjective, because the synonym itself is simple.

Here per means for:

• un sinonimo per una parola difficile = a synonym for a difficult word

This structure is very common in Italian:

• una soluzione per un problema
• un rimedio per il dolore
• un sinonimo per una parola

You may also hear other ways of expressing the idea, but per is perfectly natural here.

Again, this is mainly about normal adjective placement in Italian.

The usual, neutral order is:

• noun + adjective

So:

• una parola difficile = a difficult word

Putting the adjective before the noun is possible in some cases, but it often sounds more literary, expressive, or less neutral:

• una difficile parola

For everyday Italian, una parola difficile is the standard choice.

Yes, trovo is present indicative, first person singular:

• trovo = I find

In Italian, the present tense can describe:

• something happening now
• something habitual
• a general situation
• a vivid narration

So this sentence could mean either:

• Right now, while rereading the essay, I find a simpler synonym... or
• When I reread the essay, I find a simpler synonym...

The exact nuance depends on context.

The comma separates the introductory gerund phrase from the main clause:

• Rileggendo il tema, = introductory action
• trovo un sinonimo... = main action

In English, we often do the same:

• While rereading the essay, I find...

The comma helps readability and shows the structure clearly.

Yes. Italian word order is fairly flexible, though some versions sound more natural than others.

For example:

• Trovo un sinonimo più semplice per una parola difficile rileggendo il tema.

This is grammatically possible, but the original version is smoother because the gerund phrase naturally sets the scene first:

• Rileggendo il tema, trovo...

That order makes it immediately clear that the finding happens during the rereading.

Yes, sinonimo is a masculine noun:

• un sinonimo
• il sinonimo
• i sinonimi

So the adjective and article must match it:

• un sinonimo più semplice

By contrast:

• parola is feminine
• una parola difficile

So in the same sentence you see both:

• un sinonimo = masculine
• una parola = feminine