irrelevant...
murderous is adjective not a noun. It doesn't HAVE singular OR plural form..
Savage, or murderous.
The noun 'murder' is a singular, common, abstract noun; a word for a determination that the taking the life of a human being is intentional and unlawful; and in its informal context as a word for a difficult or unpleasant task or experience; a word for a concept; a word for a thing.
Bacterium is the singular word.
the singular word it is salmon.
singular
Adenoma is the singular of adenomata.
The word 'Phenomenon' is singular. The plural form is 'Phenomena'.
singular of the word stitches is stitch.
Lance is singular.
The word "hang" is singular.
Yes, the word "document" is singular.
The word dog is the singular form.