Word: capstone
Part of speech: Noun
Syllables: cap
stone
Definition: Any of the stones making up the top layer of a wall; a coping stone.
Morphemes:
Affix: cap
Language: en
PoS: Noun
Meaning: Something covering the top or end of a thing for protection or ornament.
Affix: stone
Language: en
PoS: Verb
Meaning: To wall with stones.