Word: rubstones
Part of speech: Noun
Syllables: rub
stones
Definition: Plural of rubstone;  are used to sharpen the edges of steel tools and implements, such as knives, scissors, scythes, razors, chisels, hand scrapers, and plane blades, through grinding and honing
Morphemes:
Affix: rub
Language: en
PoS: Noun
Meaning: Any substance designed to be applied by rubbing.
Affix: stone
Language: en
PoS: Verb
Meaning: To lap with an abrasive stone to remove surface irregularities.
Affix: -s
Language: en
PoS: Suffix
Meaning: Used to form many pluralia tantum (nouns that are almost or entirely without singular forms).