Which suffix can be added to the word need?

Here are some suffixes that can be added to the word "need":

Nouns:

* -y: needy (someone in need)

* -er: need-er (a person who needs something)

* -ing: needing (the state of needing something)

Adjectives:

* -ful: needful (necessary, required)

* -less: needless (unnecessary, not required)

Verbs:

* -ed: needed (past tense of need)

* -ing: needing (present participle of need)

Other:

* -s: needs (plural form of need)

The specific suffix you choose will depend on the meaning you want to convey.