fossilised vs ossified

fossilised and ossified both are adjectives.

Word	Noun	Adjective	Verb	Adverb
fossilised	No	Yes	No	No
ossified	No	Yes	No	No

As adjectives, fossilised and ossified are synonyms defined as:

fossilised and ossified: set in a rigidly conventional pattern of behavior, habits, or beliefs

Other synonyms of fossilised include fossilized.

fossilised (adjective)	ossified (adjective)
set in a rigidly conventional pattern of behavior, habits, or beliefs	set in a rigidly conventional pattern of behavior, habits, or beliefs