taper vs rushlight

taper and rushlight both are nouns.

Word	Noun	Adjective	Verb	Adverb
taper	Yes	No	Yes	No
rushlight	Yes	No	No	No

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

Other hyponyms of taper include chandlery, dip, rush candle, vigil candle, vigil light.

taper (noun)	rushlight (noun)
stick of wax with a wick in the middle	a tallow candle with a rush stem as the wick
a loosely woven cord (in a candle or oil lamp) that draws fuel by capillary action up into the flame
the property possessed by a shape that narrows toward a point (as a wedge or cone)
a convex shape that narrows toward a point

taper (verb)	rushlight (verb)
give a point to
diminish gradually