eucalyptus vs eucalypt

eucalyptus and eucalypt both are nouns.

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

As nouns, eucalyptus and eucalypt are synonyms defined as:

Other synonyms of eucalyptus include eucalyptus tree.

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