亙る[wataru] to cross over
幾年にも亙る[ikunennimowataru] extending over a number of years

聯亙[renkou] extending in a row
亙古[kouko] from long ago up until the present day

関聯[kanren] relation
聯繋[renkei] connection
聯合[rengou] union
聯想[rensou] association (of ideas)
聯隊[rentai] regiment

聯邦[renpou] commonwealth
聯盟[renmei] league
聯絡[renraku] to contact
聯立[renritsu] alliance
聯句[renku] linked verse