A synonym for a large knife is "machete." Other options include "cutlass" or "saber," depending on the specific type and use of the knife.
poke
BladeShankShivPig stickerCutterBayonetDaggerStilettoLancetBitMacheteKrisWhittleScalpelEdgeDirkSnickersneePointSkiverSkewerSpitToad-stabberTickler
Synonym: big Antonym: small
Large.
Large
Large knife
Immense is a synonym for large that begins with 'I'.
large estate
Large
Hefty, weighty, large, fat
A large, strong clasp knife for the pocket; a pocket knife.
Machete