5-hydroxytryptamine vs serotonin

5-hydroxytryptamine and serotonin both are nouns.

Word	Noun	Adjective	Verb	Adverb
5-hydroxytryptamine	Yes	No	No	No
serotonin	Yes	No	No	No

As nouns, 5-hydroxytryptamine and serotonin are synonyms defined as:

5-hydroxytryptamine and serotonin: a neurotransmitter involved in e.g. sleep and depression and memory

5-hydroxytryptamine (noun)	serotonin (noun)
a neurotransmitter involved in e.g. sleep and depression and memory	a neurotransmitter involved in e.g. sleep and depression and memory