Word: felstones
Part of speech: Noun
Syllables: fel
stones
Definition: Plural of felstone. Felsite.
Morphemes:
Affix: felstone
Language: en
PoS: Noun
Meaning: Felsite; a very fine-grained  volcanic rock that may or may not contain larger crystals
Affix: -s
Language: en
PoS: Suffix
Meaning: Used to form regular plurals of nouns.