mushroom Get Printable Handwriting (mush-room) 2 syllables Rhymes Learn It! Spelling Test Definition noun. any of various fleshy fungi of the subdivision Basidiomycota consisting of a cap at the end of a stem arising from an underground mycelium Example Sentence I found a mushroom in my garden. Synonyms fungi; fungus; agaric Antonyms animal Rhymes Two Syllable Rhymes (1) mushroom Share with your friends: