occupier vs occupant

occupier and occupant both are nouns.

Word	Noun	Adjective	Verb	Adverb
occupier	Yes	No	No	No
occupant	Yes	No	No	No

As nouns, occupier and occupant are synonyms defined as:

occupier and occupant: someone who lives at a particular place for a prolonged period or who was born there

Other synonyms of occupier include resident.

occupier (noun)	occupant (noun)
someone who lives at a particular place for a prolonged period or who was born there	someone who lives at a particular place for a prolonged period or who was born there
a member of a military force who is residing in a conquered foreign country