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Synonyms for Neck (same or very similar meaning)

WordNet sense 1 (the part of an organism that connects the head to the rest of the body):
cervix

WordNet sense 2 (an opening in a garment for the neck of the wearer; a part of the garment near the wearer's neck):
neck opening

WordNet sense 3 (kiss, embrace, or fondle with sexual passion):
make out


From the ODE community, based on WordNetadd/edit