plaster vs roughcast

plaster and roughcast both are nouns.

Word	Noun	Adjective	Verb	Adverb
plaster	Yes	No	Yes	No
roughcast	Yes	No	Yes	No

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

plaster: a mixture of lime or gypsum with sand and water; hardens into a smooth solid; used to cover walls and ceilings
roughcast: a coarse plaster for the surface of external walls

As verbs, roughcast is a hyponym of plaster; that is, roughcast is a word with a more specific, narrower meaning than plaster:

Other hyponyms of plaster include render-set, parget, mud, mortar.

plaster (noun)	roughcast (noun)
adhesive tape used in dressing wounds	a rough preliminary model
a surface of hardened plaster (as on a wall or ceiling)	a coarse plaster for the surface of external walls
a medical dressing consisting of a soft heated mass of meal or clay that is spread on a cloth and applied to the skin to treat inflamed areas or improve circulation etc.
a mixture of lime or gypsum with sand and water; hardens into a smooth solid; used to cover walls and ceilings
any of several gypsum cements; a white powder (a form of calcium sulphate) that forms a paste when mixed with water and hardens into a solid; used in making molds and sculptures and casts for broken limbs

plaster (verb)	roughcast (verb)
dress by covering with a therapeutic substance	hew roughly, without finishing the surface
coat with plaster	apply roughcast to
apply a heavy coat to	shape roughly
apply a plaster cast to
affix conspicuously
cover conspicuously or thickly, as by pasting something on