Mass nouns are used when something is conceptualized as a homogeneous group.

University of Michigan - Ann Arbor

Common nouns include concrete terms like cat and mango, abstractions like algorithm and beauty, and verb-like terms like pacing as in His pacing to and fro became quite annoying.

Common noun

An on-going but a helpful book resource about NLP
https://web.stanford.edu/~jurafsky/slp3/

Speech and Language Processing (3rd ed. draft) 

Count nouns can occur in the singular and plural (goat/goats, relationship/relationships) and can be counted (one goat, two goats).

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