traveller's joy vs traveler's joy

traveller's joy and traveler's joy both are nouns.

Word	Noun	Adjective	Verb	Adverb
traveller's joy	Yes	No	No	No
traveler's joy	Yes	No	No	No

As nouns, traveller's joy and traveler's joy are synonyms defined as:

traveller's joy and traveler's joy: vigorous deciduous climber of Europe to Afghanistan and Lebanon having panicles of fragrant green-white flowers in summer and autumn

Other synonyms of traveller's joy include Clematis vitalba, old man's beard.

traveller's joy (noun)	traveler's joy (noun)
vigorous deciduous climber of Europe to Afghanistan and Lebanon having panicles of fragrant green-white flowers in summer and autumn	vigorous deciduous climber of Europe to Afghanistan and Lebanon having panicles of fragrant green-white flowers in summer and autumn