croup vs spasmodic laryngitis

croup and spasmodic laryngitis both are nouns.

Word	Noun	Adjective	Verb	Adverb
croup	Yes	No	No	No
spasmodic laryngitis	Yes	No	No	No

As nouns, croup and spasmodic laryngitis are synonyms defined as:

croup and spasmodic laryngitis: a disease of infants and young children; harsh coughing and hoarseness and fever and difficult breathing

croup (noun)	spasmodic laryngitis (noun)
the part of an animal that corresponds to the human buttocks	a disease of infants and young children; harsh coughing and hoarseness and fever and difficult breathing
a disease of infants and young children; harsh coughing and hoarseness and fever and difficult breathing