Regular phonological variant of -о́к (-ók) after mostly paired palatal sounds.
-ёк • (-jók)
- Alternative form of -о́к (-ók) (after consonants followed by the soft sign ь and after the unpaired palatal й)
- гусь (gusʹ, “goose”) + -ёк (-jók) → гусёк (gusjók, “goose”)
- чай (čaj, “tea”) + -ёк (-jók) → чаёк (čajók, “tea”)