medical aid vs dressing

medical aid and dressing both are nouns.

Word	Noun	Adjective	Verb	Adverb
medical aid	Yes	No	No	No
dressing	Yes	No	No	No

As nouns, dressing is a hyponym of medical aid; that is, dressing is a word with a more specific, narrower meaning than medical aid:

medical aid (noun)	dressing (noun)
professional treatment for illness or injury	the activity of getting dressed; putting on clothes
	the act of applying a bandage
	processes in the conversion of rough hides into leather
	a cloth covering for a wound or sore
	making fertile as by applying fertilizer or manure
	savory dressings for salads; basically of two kinds: either the thin French or vinaigrette type or the creamy mayonnaise type
	a mixture of seasoned ingredients used to stuff meats and vegetables