methyl bromide vs bromide

methyl bromide and bromide both are nouns.

Word	Noun	Adjective	Verb	Adverb
methyl bromide	Yes	No	No	No
bromide	Yes	No	No	No

As nouns, bromide is a hypernym of methyl bromide; that is, bromide is a word with a broader meaning than methyl bromide:

methyl bromide: a poisonous gas or liquid (CH3Br) used to fumigate rodents, worms, etc.
bromide: any of the salts of hydrobromic acid; formerly used as a sedative but now generally replaced by safer drugs

methyl bromide (noun)	bromide (noun)
a poisonous gas or liquid (CH3Br) used to fumigate rodents, worms, etc.	a trite or obvious remark
	any of the salts of hydrobromic acid; formerly used as a sedative but now generally replaced by safer drugs