TPN vs alimentation

TPN and alimentation both are nouns.

Word	Noun	Adjective	Verb	Adverb
TPN	Yes	No	No	No
alimentation	Yes	No	No	No

As nouns, alimentation is a hypernym of TPN; that is, alimentation is a word with a broader meaning than TPN:

TPN: administration of a nutritionally adequate solution through a catheter into the vena cava; used in cases of long-term coma or severe burns or severe gastrointestinal syndromes
alimentation: the act of supplying food and nourishment

Other hypernyms of TPN include feeding.

TPN (noun)	alimentation (noun)
administration of a nutritionally adequate solution through a catheter into the vena cava; used in cases of long-term coma or severe burns or severe gastrointestinal syndromes	the act of supplying food and nourishment
	a source of materials to nourish the body