eucalypt vs eucalyptus

eucalypt and eucalyptus both are nouns.

Word	Noun	Adjective	Verb	Adverb
eucalypt	Yes	No	No	No
eucalyptus	Yes	No	No	No

As nouns, eucalypt and eucalyptus are synonyms defined as:

Other synonyms of eucalypt include eucalyptus tree.

eucalypt (noun)	eucalyptus (noun)
a tree of the genus Eucalyptus	a tree of the genus Eucalyptus
	wood of any of various eucalyptus trees valued as timber