Afraid of: https://wiki.dothraki.org/High_Valyrian_Verb_Tables#Voiced-stop_stems

1. I am afraid of: Izūgan.
2. He/She/It is afraid of: Izūgas.
3. They are afraid of: Izūgis.

Turtle: https://wiki.dothraki.org/High_Valyrian_Noun_Declensions#Aquatic-type:_r.C5.8Dbir

1. Nominative: Qintir (Singular), Qintra (Plural).
2. Accusative: Qintir (Singular), Qintra (Plural).

Ocean: https://wiki.dothraki.org/High_Valyrian_Noun_Declensions#Aquatic-type:_embar

1. Nominative: Embar (Singular), Embri (Plural).
2. Accusative: Embri (Singular), Embrii (Plural).

"Izuugas" isn't accepted here