oestrogen vs Australian spelling

oestrogen and Australian spelling both are nouns.

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

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