gumri -gumr- experimental gismu

x1 is a mushroom of species x2.

Cf. mledi, ledgrute

In notes:

campinoni
x1 is a button mushroom/portobello/champignon de Paris of variety x2.
gadnu
x1 is an advertisement, a public notice about x2.
guknu
x1 is a bow (the weapon) for shooting arrows x2.