As nouns the difference between flower and kniphofia

is that flower is a colorful, conspicuous structure associated with angiosperms, frequently scented and attracting various insects, and which may or may not be used for sexual reproduction or flower can be something that flows, such as a river while kniphofia is any of several plants, of the genus , having bright, upright flowers.

As a verb flower

is to put forth blooms.