a mountain (large mass of earth and rock) or (large) hill / a mine (excavation usually consisting of small tunnels) / a heap, pile / the top or high part of an object / a chance, gamble / a climax, peak

(colloquial) huge, big, severe, intense

(slang) a detective, a plainclothes police officer or constable

deca-

the maple family, Aceraceae

decagram

prefix for species that are wild or residing in mountains

a surname

suffix for names of mountains / suffix for a temple's honorific mountain name (山号 (sangō))

mountain / temple, temple ground / Short for 比叡山 (Hieizan): Mount Hiei / mine