oasis vs haven

oasis and haven both are nouns.

Word	Noun	Adjective	Verb	Adverb
oasis	Yes	No	No	No
haven	Yes	No	No	No

As nouns, oasis and haven are synonyms defined as:

oasis (noun)	haven (noun)
a shelter serving as a place of safety or sanctuary	a shelter serving as a place of safety or sanctuary
a fertile tract in a desert (where the water table approaches the surface)	a sheltered port where ships can take on or discharge cargo