hilus vs hilum

hilus and hilum both are nouns.

Word	Noun	Adjective	Verb	Adverb
hilus	Yes	No	No	No
hilum	Yes	No	No	No

As nouns, hilus and hilum are synonyms defined as:

hilus and hilum: (anatomy) a depression or fissure where vessels or nerves or ducts enter a bodily organ

hilus (noun)	hilum (noun)
(anatomy) a depression or fissure where vessels or nerves or ducts enter a bodily organ	(anatomy) a depression or fissure where vessels or nerves or ducts enter a bodily organ
	the scar on certain seeds marking its point of attachment to the funicle