-ιστής

The agent-noun suffix -τής (-tḗs) added to the stem of a verb in -ίζω (-ízō).

-ῐστής • (-ĭstḗs) m (genitive -ῐστοῦ); first declension

1. alternative form of -τής (-tḗs)

• -ισμός (-ismós)

From Ancient Greek -ιστής (-istḗs). When it is added to a verb, it is usually of the ending -ίζω (-ízo).

• IPA^(key): /iˈstis/

-ιστής • (-istís) m (feminine -ίστρια)

1. added to a noun or adjective to create words for a male person who is a follower or supporter of that notion; -ist:

   ‎κομμουνισμός (kommounismós, “Communism”) + ‎-ιστής (-istís) → ‎κομμουνιστής (kommounistís, “Communist”)

   ‎εθνικός (ethnikós, “ethnic, national”) + ‎-ιστής (-istís) → ‎εθνικιστής (ethnikistís, “nationalist”)

   ‎Ισλάμ (Islám, “Islam”) + ‎-ιστής (-istís) → ‎ισλαμιστής (islamistís, “Islamist”)

2. added to a noun, adjective or verb to create words for a male person who behaves in a certain way; -ist, -er:

   ‎εγώ (egó, “I”) + ‎-ιστής (-istís) → ‎εγωιστής (egoïstís, “egoist, selfish”)

   ‎υπερασπίζω (yperaspízo, “to defender”) + ‎-ιστής (-istís) → ‎υπερασπιστής (yperaspistís, “defender”)

   ‎έτσι θέλω (étsi thélo, “that's the way I want”) + ‎-ιστής (-istís) → ‎ετσιθελιστής (etsithelistís, “arbitrary person”)

3. added to a noun or verb to create words for a male person who is a habitual doer of said action; -ist, -er:

   ‎ποδόσφαιρο (podósfairo, “football”) + ‎-ιστής (-istís) → ‎ποδοσφαιριστής (podosfairistís, “footballer”)

   ‎σκάκι (skáki, “chess”) + ‎-ιστής (-istís) → ‎σκακιστής (skakistís, “chess player”)

• -ισμός m (-ismós) (noun ending, -ism)
• -ιστικός (-istikós) (adjectival ending)