First off, there is no such word as agreedment. But assuming it's just a typo for agreement, if it's preceded by singular, the word singular is an adjective, not a noun.
No the word notes is a plural noun. The singular noun is note.
Yes the word question is a singular noun. The plural noun is questions.
The noun garb is used as a group noun to mean clothing. It uses singular verbs.
The noun 'loss' is the singular noun. The plural noun is losses.
No the word muddy is not a noun at all. The word muddy is an adjective.
No the word notes is a plural noun. The singular noun is note.
The singular form is phenomenon.
Yes the word formation is a singular noun. The plural noun is formations.
The word army is a singular noun; armies is the plural form.
The noun personalities is the plural form for the singular noun personality.
Yes, the word 'friendship' is a noun; a singular, common, abstract noun; a word for an emotional relationship between people; a word for a thing.
The word tooth is the singular noun. The plural noun is teeth.
The word finder is the singular noun. The plural noun is finders.
The word actress is the singular noun. The plural noun is actresses.
Yes the word question is a singular noun. The plural noun is questions.
The noun garb is used as a group noun to mean clothing. It uses singular verbs.
The word aisle is a singular noun. The plural noun is aisles.