substitution vs weaning

substitution and weaning both are nouns.

Word	Noun	Adjective	Verb	Adverb
substitution	Yes	No	No	No
weaning	Yes	No	No	No

As nouns, weaning is a hyponym of substitution; that is, weaning is a word with a more specific, narrower meaning than substitution:

substitution: the act of putting one thing or person in the place of another:
weaning: the act of substituting other food for the mother's milk in the diet of a child or young mammal

Other hyponyms of substitution include replacement, replacing, subrogation, ablactation.

substitution (noun)	weaning (noun)
the act of putting one thing or person in the place of another:	the act of substituting other food for the mother's milk in the diet of a child or young mammal
an event in which one thing is substituted for another