What suffix would indicate the word is a noun?

There isn't a single, magical suffix that *always* indicates a noun. Many words don't have suffixes at all, and even when they do, the suffix might not be the giveaway.

However, there are some common suffixes that *often* signal nouns:

Common Noun Suffixes:

* -tion: formation, education, celebration

* -ment: movement, judgment, agreement

* -ness: sadness, happiness, kindness

* -ity: activity, creativity, ability

* -er/-or: teacher, writer, actor

* -ship: friendship, leadership, scholarship

* -hood: childhood, womanhood, brotherhood

* -ism: capitalism, communism, realism

* -ance/-ence: importance, confidence, resilience

Important Notes:

* Not every word ending in these suffixes is a noun. For example, "reader" can be a noun (a person who reads) or a verb (to read something).

* Many words without these suffixes are still nouns. "House," "dog," "love" are all nouns without any fancy suffixes.

The best way to tell if a word is a noun is to consider its role in the sentence. If the word is the subject, direct object, or object of a preposition, it's most likely a noun.