gynaecology vs British spelling

gynaecology and British spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
gynaecology	Yes	No	No	No
British spelling	Yes	No	No	No

gynaecology (noun)	British spelling (noun)
the branch of medicine that deals with the diseases and hygiene of women	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')