hole plug vs plug button

hole plug and plug button both are nouns.

Word	Noun	Adjective	Verb	Adverb
hole plug	Yes	No	No	No
plug button	Yes	No	No	No

As nouns, hole plug and plug button are synonyms defined as:

hole plug and plug button: A small, flat plug made of plastic, metal or wood, used to cover holes and visible screws in furniture.

hole plug (noun)	plug button (noun)
A small, flat plug made of plastic, metal or wood, used to cover holes and visible screws in furniture.	A small, flat plug made of plastic, metal or wood, used to cover holes and visible screws in furniture.