As nouns the difference between alimentation and nourishment
is that alimentation is feeding, being fed; the provision of food and other necessities while nourishment is the act of nourishing or the state of being nourished.
alimentation
English
Noun
(
en noun)
feeding, being fed; the provision of food and other necessities.
References
* OED2
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nourishment
English
Noun
the act of nourishing or the state of being nourished
something that nourishes; food