gusher vs oil well

gusher and oil well both are nouns.

Word	Noun	Adjective	Verb	Adverb
gusher	Yes	No	No	No
oil well	Yes	No	No	No

As nouns, oil well is a hypernym of gusher; that is, oil well is a word with a broader meaning than gusher:

gusher: an oil well with a strong natural flow so that pumping is not necessary
oil well: a well that yields or has yielded oil

Other hypernyms of gusher include oiler.

gusher (noun)	oil well (noun)
an oil well with a strong natural flow so that pumping is not necessary	a well that yields or has yielded oil