WordNet sense 1 (any of various flowers of plants of the genus Dianthus cultivated for their fragrant flowers):

garden pink

WordNet sense 2 (a person with mildly leftist political views):

pinko

WordNet sense 3 (make light, repeated taps on a surface):

knock, rap, tap

WordNet sense 4 (sound like a car engine that is firing too early):

ping

WordNet sense 5 (of a light shade of red):

pinkish

WordNet sense 6 (being or having or characterized by hue):

chromatic