Yes, garden centre is a noun.
noun
No it is a place - a noun or "to centre" is a verb
centre
common noun
centre
Whether a word is a noun or a verb depends on its function in the sentence. Centre is a noun in the following sentence: People thought that the Earth was the centre of the universe. Centre is a verb in the next sentence: "All these theories centre on two battles in Estonia" (quoted from Wikipedia)
Common
Common noun
common
Pea is a common noun, and peas is the plural...still a common noun.
The noun giraffe is a singular, concrete noun. The noun giraffe is a common noun, a word for any giraffe anywhere.A proper noun is the name of a specific person, place, thing, or a title; for example:Geoffrey theGiraffe, the Toys 'r' Us mascotGiraffe Centre, Nairobi, KenyaGiraffe Avenue, Brampton, ON CanadaGiraffe Stop (restaurant), Kings Cross Station, London, UK"Giraffes Tell Secrets: Welcome to the Village", a novel by Jeanin Morgado