This is the 11165th most frequent Spanish word.
enamorados
"Enamorados" means "people who are in love."
In this sentence, 'enamorados' is an adjective referring to Maria and Juan being in a state of being in love with each other.
María y Juan están enamorados.
Maria and Juan are in love.
Here, 'enamorados' functions as a noun meaning 'people who are in love,' specifying those exchanging gifts.
Los enamorados intercambian regalos en San Valentín.
Lovers exchange gifts on Valentine's Day.
In this usage, 'enamorados' operates as a noun, comparing the people described to lovers, implying romantic affection.