Climbed is a verb, the past tense of climb.
Climb can be a noun. eg
We did a difficult climb in the mountains this summer
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The noun 'trees' functions as the direct objectof the verb 'climbing', for example:We were climbing trees to reach the apples.The term 'climbing trees' as a noun phrase (the gerund 'climbing' modifying the noun 'trees') can functions as:a subject: Climbing trees can be fun.an object: Squirrels are known for climbing trees.
Common noun
Pea is a common noun, and peas is the plural...still a common noun.
A common noun.
Th word tail is a common noun because the first letter of a proper noun is capitalized.