The difference between Plurale tantum and Singulare tantum
When used as nouns, plurale tantum means a noun (in any specific sense) that has no singular form, such as (in most usage), 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 Plurale tantum and Singulare tantum
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Plurale tantum as a noun (grammar):
A noun (in any specific sense) that has no singular form, such as (in most usage).
Examples:
"Roger wasn’t sure whether “jeans” was a true plurale tantum, since the word “jean” exists and describes a type of cloth."
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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.