Mycologists would avoid the term in formal communication entirely; the terms of art would be Basidiocarp for basids and Ascocarp for ascos, or sporocarp generally. In less formal communication my experience has been that mushroom is used as a colloquial stand-in for any sort of macroscopic sporocarp. Linguistic prescriptivism can be fun ("Hey guys - did you a tomato is actually a berry?!") but the stipe-pileus-hymenium model of a mushroom is so narrowly defined I don't know of anyone who could legitimately stick to it without slipping up at some point.