feeding vs TPN

feeding and TPN both are nouns.

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

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

feeding: the act of supplying food and nourishment
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

feeding (noun)	TPN (noun)
the act of consuming food	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