nucleolus organiser vs nucleolar organizer

nucleolus organiser and nucleolar organizer both are nouns.

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

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

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

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

nucleolus organiser (noun)	nucleolar organizer (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