oiler vs spouter

oiler and spouter both are nouns.

Word	Noun	Adjective	Verb	Adverb
oiler	Yes	No	No	No
spouter	Yes	No	No	No

As nouns, spouter is a hyponym of oiler; that is, spouter is a word with a more specific, narrower meaning than oiler:

Other hyponyms of oiler include gusher, stripper, stripper well, wildcat, wildcat well.

oiler (noun)	spouter (noun)
a cargo ship designed to carry crude oil in bulk	a spouting whale
a well that yields or has yielded oil	an oil well that is spouting
a worker who oils engines or machinery	an obnoxious and foolish and loquacious talker