Australian spelling vs oestrogen

Australian spelling and oestrogen both are nouns.

Word	Noun	Adjective	Verb	Adverb
Australian spelling	Yes	No	No	No
oestrogen	Yes	No	No	No

Australian spelling (noun)	oestrogen (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')	a general term for female steroid sex hormones that are secreted by the ovary and responsible for typical female sexual characteristics