Question

Какое проверочное слово к слову ивняка

Answer 1

Ивняк, ива. Дерево такое)

Answer 2

Ива, ивы, ивачка, ивашка

Answer 3

Проверочное слово к слову "ивняка"

Проверочное слово к слову "ивняка" - "впрочем".

This information is based on the search result snippet from Source which provides a list of words and their corresponding check words. The snippet specifically mentions the check word for "ивняка" as "впрочем" within a list of other words and their check words.