mineral fertilizer vs mineral fertiliser

mineral fertilizer and mineral fertiliser both are nouns.

Word	Noun	Adjective	Verb	Adverb
mineral fertilizer	Yes	No	No	No
mineral fertiliser	Yes	No	No	No

As nouns, mineral fertilizer and mineral fertiliser are synonyms defined as:

mineral fertilizer and mineral fertiliser: an inorganic fertilizer which contains trace minerals.

mineral fertilizer (noun)	mineral fertiliser (noun)
an inorganic fertilizer which contains trace minerals.	an inorganic fertilizer which contains trace minerals.