dose vs lethal dose

dose and lethal dose both are nouns.

Word	Noun	Adjective	Verb	Adverb
dose	Yes	No	Yes	No
lethal dose	Yes	No	No	No

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

dose (noun)	lethal dose (noun)
a measured portion of medicine taken at any one time	the size dose that will cause death
street name for lysergic acid diethylamide
the quantity of an active agent (substance or radiation) taken in or absorbed at any one time
a communicable infection transmitted by sexual intercourse or genital contact

dose (verb)	lethal dose (verb)
administer a drug to
treat with an agent; add (an agent) to