Blackhead and Pustulate

Blackhead noun - A black-tipped plug clogging a pore of the skin.

Pustulate and blackhead are semantically related. In some cases you can replace term "Pustulate" with "Blackhead", this nouns are similar.

Pustulate adjective - (of complexion) blemished by imperfections of the skin.

Blackhead and pustulate are semantically related. You can use "Blackhead" instead a noun "Pustulate".