▁usually ▁uno fficial , ▁name ▁of ▁an ▁entity ; ▁a ▁pet - name ▁or ▁" nick name " ▁ ▁hy pon ym : ▁an ▁item ▁that ▁belongs ▁to ▁and ▁is ▁equally ▁ranked ▁in ▁a ▁generic ▁class ▁or ▁group , ▁for ▁example ▁" l ily " ▁or ▁" v io let " ▁in ▁the ▁class ▁of ▁" flow ers "; ▁or ▁" lim ous ine " ▁or ▁" h atch back " ▁in ▁the ▁class ▁of ▁" autom ob iles ." ▁A ▁hy pon ym ▁is ▁said ▁to ▁be ▁" sub ordinate " ▁to ▁a ▁hyper onym . ▁ ▁is onym : ▁ 1 : ▁a ▁word ▁having ▁the ▁same ▁root ▁or ▁stem ▁as ▁another ▁— ▁also ▁known ▁as ▁par onym . ▁Comp are ▁ex onym , ▁heter onym , ▁par onym , ▁and ▁syn onym . ▁ 2 : ▁one ▁person ' s ▁surname ▁that ▁is ▁the ▁same ▁as ▁another ▁person ' s ▁surname . ▁ 3 : ▁Bi ol . ▁a ▁tax onom ic ▁design ation ▁that ▁is ▁identical ▁to ▁another ▁design ation , ▁and ▁based ▁on ▁the ▁same ▁type , ▁but ▁published ▁at ▁a ▁different ▁time ▁by ▁the ▁same ▁or ▁other ▁authors ▁( see ▁is onym ▁( tax onomy )). ▁ ▁lingu onym : ▁a ▁name ▁of ▁a ▁language ▁ ▁mer onym : ▁a ▁word ▁that ▁names ▁a ▁part ▁that ▁belongs ▁to ▁and ▁is ▁therefore ▁sub ordinate ▁to ▁a ▁larger ▁entity ; ▁a ▁part - who le ▁relationship , ▁such ▁as ▁" door " ▁or ▁" window " ▁in ▁" house