We don't have synonyms for caple yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are cable, cape and maple.
"Late C14: 'Herkne, my bro?er, herkne, by ?y fei?! / Herestow nat how ?at ?e cartere sei?? / Hent it anon, for he ha? yeve it ?ee,/ Bo?e hey and cart, and eek his caples ?re.' -- Geoffrey Chaucer, The Friar's Tale"
"Late C14: 'Herkne, my bro?er, herkne, by ?y fei?! / Herestow nat how ?at ?e cartere sei?? / Hent it anon, for he ha? yeve it ?ee,/ Bo?e hey and cart, and eek his caples ?re.' -- Geoffrey Chaucer, The Friar's Tale"