一匹[ippiki] one animal (small)
数匹[suuhiki] several animals
馬匹[bahitsu] horses
匹敵[hitteki] comparing with
匹夫[hippu] (humble) man

匹夫の勇[hippunoyuu] rash courage
匹夫匹婦[hippuhippu] coarse men and women
匹婦[hippu] coarse woman
匹儔[hicchuu] equal