fertilisation vs fertilization

fertilisation and fertilization both are nouns.

Word	Noun	Adjective	Verb	Adverb
fertilisation	Yes	No	No	No
fertilization	Yes	No	No	No

As nouns, fertilisation and fertilization are synonyms defined as:

fertilisation and fertilization: creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant

Other synonyms of fertilisation include fecundation, impregnation.

As nouns, fertilisation and fertilization are synonyms defined as:

fertilisation and fertilization: making fertile as by applying fertilizer or manure

Other synonyms of fertilisation include dressing, fecundation.

fertilisation (noun)	fertilization (noun)
creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant	creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant
making fertile as by applying fertilizer or manure	making fertile as by applying fertilizer or manure