The word group's is singular possessive for the noun group; the apostrophe s indicates that something in the sentence belongs to the group.
Yes, the plural noun 'groups' is a concrete noun as a word for a number of people or things considered as a unit.The plural noun 'groups' is an abstract noun as a word for classifications of people or things.The word 'groups' is also the third person, singular of the verb to 'group'.
No the word notes is a plural noun. The singular noun is note.
The word "loss" is singular. It refers to the act or instance of losing something.
The word army is a singular noun; armies is the plural form.
The word 'antelope' is a singular noun, a word for one animal.The plural noun is 'antelopes'.
The noun 'scales' is a plural noun, a word form two or more.The singular noun is 'scale'.
The noun personalities is the plural form for the singular noun personality.
The word clotheslines is a plural noun. The singular noun is clothesline.
The word temperature is a singular noun. The plural noun is temperatures.
The word aisle is a singular noun. The plural noun is aisles.
The noun teeth is plural.The plural form is tooth.
The noun 'orchid' is a singular noun, a word for one.The plural noun is 'orchids'.