Döviz kuru bugün hızlıca yükseldi.

Döviz kuru means “exchange rate.” It’s a noun-noun compound in Turkish where:

• döviz = “foreign currency” (first noun, uninflected)
• kuru = “rate” with a 3rd-person possessive suffix (see next question)

Together they form a fixed expression equivalent to English “the rate of foreign currency.”

The -u is the 3rd-person singular possessive suffix (Turkish –i/–ı/–u/–ü with vowel harmony). In this kind of compound, the first noun stays bare (döviz) and the second noun takes the possessive ending:

• kur
  • -u → kuru
    This literally marks “the rate of (that) foreign currency.”

Turkish has no separate definite or indefinite articles. Instead:

• Definite meaning (“the”) is often inferred from context or a possessive ending.
• Indefinite meaning (“a/an”) can be marked by the suffix -(y)A before a noun (e.g., kitap = “book,” kitap*-*a = “to a book”).

In döviz kuru, the possessive suffix on kuru helps convey “the exchange rate.”

hızlı = “fast” (adjective)

• -ca = a productive adverb-forming suffix (with vowel harmony)
  → hızlıca = “quickly” or “rapidly”

Yes. Turkish allows a few ways to say “quickly”:

• hızla (using the instrumental/adverbial suffix -la/-le)
• hızlıca (using -ca)
• In colloquial speech sometimes just hızlı is understood adverbially.

All three are acceptable, though hızlıca and hızla are most common in writing.