lighter vs touchwood

lighter and touchwood both are nouns.

Word	Noun	Adjective	Verb	Adverb
lighter	Yes	No	Yes	No
touchwood	Yes	No	No	No

As nouns, touchwood is a hyponym of lighter; that is, touchwood is a word with a more specific, narrower meaning than lighter:

Other hyponyms of lighter include firelighter, kindling, punk, spunk, tinder, punk.

lighter (noun)	touchwood (noun)
a device for lighting or igniting fuel or charges or fires	material for starting a fire
a flatbottom boat for carrying heavy loads (especially on canals)
a substance used to ignite or kindle a fire

lighter (verb)	touchwood (verb)
transport in a flatbottom boat