nucleolar organiser vs nucleolus organiser

nucleolar organiser and nucleolus organiser both are nouns.

Word	Noun	Adjective	Verb	Adverb
nucleolar organiser	Yes	No	No	No
nucleolus organiser	Yes	No	No	No

As nouns, nucleolar organiser and nucleolus organiser are synonyms defined as:

nucleolar organiser and nucleolus organiser: the particular part of a chromosome that is associated with a nucleolus after nuclear division

Other synonyms of nucleolar organiser include nucleolar organizer, nucleolus organizer.

nucleolar organiser (noun)	nucleolus organiser (noun)
the particular part of a chromosome that is associated with a nucleolus after nuclear division	the particular part of a chromosome that is associated with a nucleolus after nuclear division