eucalyptus vs eucalyptus

eucalyptus and eucalyptus both are nouns.

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

eucalyptus (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	wood of any of various eucalyptus trees valued as timber