Pappus and Thistledown

Pappus noun - Calyx composed of scales or bristles or featherlike hairs in plants of the Compositae such as thistles and dandelions.

Thistledown and pappus are semantically related. In some cases you can replace term "Thistledown" with "Pappus", this nouns are similar.

Thistledown noun - Pappus of a thistle consisting of silky featherlike hairs attached to the seed-like fruit of a thistle.

Pappus and thistledown are semantically related. Sometimes you can use "Pappus" instead a noun "Thistledown".