specialism vs specialisation

specialism and specialisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
specialism	Yes	No	No	No
specialisation	Yes	No	No	No

As nouns, specialism and specialisation are synonyms defined as:

specialism and specialisation: the special line of work you have adopted as your career

Other synonyms of specialism include speciality, specialization, specialty.

specialism (noun)	specialisation (noun)
the special line of work you have adopted as your career	the special line of work you have adopted as your career
the concentration of your efforts on a particular field of study or occupation	the act of specializing; making something suitable for a special purpose
	(biology) the structural adaptation of some body part for a particular function