Button, Oyster, Portobello
This page is the CodyCross answer for the clue below from Art Museum, Group 736, Puzzle 3 (Opening Night).
Question
Button, Oyster, Portobello
Answer
MUSHROOM
Word Meaning:
MUSHROOM — Any of the fleshy fruiting bodies of fungi typically produced above ground on soil or on their food sources (such as decaying wood).
Definitions from Wiktionary.