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NA-adjective/adjectival noun (keiyodoshi)
必用 can imply has to be used rather than is just needed
necessary, needed, essential, indispensableindispensable, nécessaire

Noun (futsuumeishi)
necessity, need, requirementнеобходи́мостьNotwendigkeit, Unerlässlichkeit, Not, Bedürfnis, Erfordernis

ON: ヒツKUN: かなら.ず
invariably, certain, inevitable

ON: ヨウKUN: い.る, かなめ
need, main point, essence, pivot, key to

ON: ヒツKUN: かなら.ず
invariably, certain, inevitable

ON: ヨウKUN: もち.いる
utilize, business, service, use, employ

Example sentences
歯医者に行く必要はない。Parts: 歯医者 (はいしゃ), 行く (いく), 必要 (ひつよう), 無い (ない)You don't need to go to the dentist's.

私たちは生きていくためには衣・食・住が必要です。Parts: 私たち (わたしたち), 生きる (いきる), 行く (いく), 為に (ために), 衣食住 (いしょくじゅう), 必要 (ひつよう)We need food, clothes and a home in order to live.

Community comments
The words and kanji on this web site come from the amazing dictionary files JMDict, EDICT and KANJIDIC. These files are the property of the Electronic Dictionary Research and Development Group, and are used in conformance with the Group's licence. The example sentences come from the projects Tatoeba and Tanaka Corpus. Kanji search by radicals is based on the Kradfile2 and Kradfile-u files containing radical decomposition of 13108 Japanese characters. Many thanks to all the people involved in those projects!