復數：word classes

n.one of the traditional categories of words intended to reflect their functions in a grammatical context

同義詞：part of speechform class

Word class:
Improving accuracy in word class tagging through the combination of machine learning systems
On the brain response to syntactic anomalies: Manipulations of word position and word class reveal individual differences.
Speak and spell: Dissociations and word-class effects.
Acoustic vowel reduction as a function of sentence accent, word stress, and word class
The impact of semantic reference on word class: an fMRI study of action and object naming.
Learning word-class lattices for definition and hypernym extraction
Choice of Grammatical Word-Class without Global Syntactic Analysis: Tagging Words in the LOB Corpus
Word-class-changing inflection and morphological theory
How selective are selective word class deficits? Two case studies of action and object naming