recall dose vs booster shot

recall dose and booster shot both are nouns.

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

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

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

Other synonyms of recall dose include booster, booster dose.

recall dose (noun)	booster shot (noun)
an additional dose that makes sure the first dose was effective	an additional dose that makes sure the first dose was effective