Yes, the noun past is a common, singular, abstract noun. The word past is also an adjective, an adverb, and a preposition.
A proper noun is the name of a specific person, place, or thing. A proper noun for the common noun 'toothpaste' is the name of a toothpaste, such as Colgate, Crest, or Tom's of Maine.
common noun
Common
Common noun
common
Pea is a common noun, and peas is the plural...still a common noun.
A common noun.
The noun "paste" has the adjective form "pasty." But one use of pasty comes from the white color of paste, and is synonymous with "pale."
Most definitely a common noun.
The word magma is a noun, a common, concrete, uncountable noun; a word for hot liquid rock from inside the Earth; a word for a substance. The origin of the word is in the Greek language, where magma is solidified paste.
Yes, toothpaste is a compound noun, made from tooth + paste.
Camel is a common noun.