recall dose vs booster

recall dose and booster both are nouns.

Word	Noun	Adjective	Verb	Adverb
recall dose	Yes	No	No	No
booster	Yes	No	No	No

As nouns, recall dose and booster are synonyms defined as:

recall dose and booster: an additional dose that makes sure the first dose was effective

Other synonyms of recall dose include booster dose, booster shot.

recall dose (noun)	booster (noun)
an additional dose that makes sure the first dose was effective	an additional dose that makes sure the first dose was effective
	the first stage of a multistage rocket
	an amplifier for restoring the strength of a transmitted signal
	a thief who steals goods that are in a store
	someone who is an active supporter and advocate
	a person who backs a politician or a team etc.