self-pollination vs pollenation

self-pollination and pollenation both are nouns.

Word	Noun	Adjective	Verb	Adverb
self-pollination	Yes	No	No	No
pollenation	Yes	No	No	No

As nouns, pollenation is a hypernym of self-pollination; that is, pollenation is a word with a broader meaning than self-pollination:

self-pollination: fertilization by transfer of pollen from the anthers to the stigma of the same flower
pollenation: transfer of pollen from the anther to the stigma of a plant

Other hypernyms of self-pollination include pollination.

self-pollination (noun)	pollenation (noun)
fertilization by transfer of pollen from the anthers to the stigma of the same flower	transfer of pollen from the anther to the stigma of a plant