The difference between Mass noun and Singulare tantum
When used as nouns, mass noun means a noun that normally cannot be counted, whereas singulare tantum means a noun (in any specific sense) that has no plural form and is only used with singular verbs. frequently for mass nouns.
check bellow for the other definitions of Mass noun and Singulare tantum
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Mass noun as a noun:
A noun that normally cannot be counted.
Examples:
"synonyms: material noun non-count noun [[uncountable]] noun"
"ant [[countable]] noun count noun"
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Singulare tantum as a noun (grammar):
A noun (in any specific sense) that has no plural form and is only used with singular verbs. Frequently for mass nouns.