From WordNet (r) 3.0 (2006):
ache n 1: a dull persistent (usually moderately intense) pain [syn: ache, aching] v 1: feel physical pain; "Were you hurting after the accident?" [syn: hurt, ache, suffer] 2: have a desire for something or someone who is not present; "She ached for a cigarette"; "I am pining for my lover" [syn: ache, yearn, yen, pine, languish] 3: be the source of pain [syn: ache, smart, hurt]