一いち部ぶ

部ぶ分ぶんN3sense 1
部分 is the general word for 'a part' of something, while 一部 more often marks that part as a distinct subset or fraction of the whole.
一いっ冊さつ sense 2
一冊 is the ordinary counter for 'one book', while 一部 is used specifically for one complete copy or set of a publication, often in formal or publishing contexts.
一いっ端たん
一部 is the common, neutral word for 'a portion' of something, while 一端 is more literary and often refers to a small or peripheral part.
一いっ環かん
一部 simply means 'one part' or 'a portion', while 一環 more strongly implies a component that fits within an organized plan, process, or chain.

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一ひと握にぎりN1
一部 simply means 'a part' or 'a portion' without implying scarcity, whereas 一握り stresses that the amount is very small.
一いち部ぶ分ぶんN1
一部 often refers abstractly to 'some part' (e.g. 一部の人は), whereas 一部分 is more concrete and physical, like a piece of an object or text.

Opposites· 14

全ぜん部ぶN5sense 1
全部 means 'all, the whole thing', the direct opposite of 一部, which means only 'a part' of something.
全ぜんN3
一部 means 'a part' or 'some of', the direct opposite of 全 which means 'all of' or 'the whole of'.
全ぜん線せん
一部 means only a part or section of a line or network, whereas 全線 means the entire line or all lines without exception.

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まるごとN1
一部 means 'a part' of something, the opposite of 丸ごと's sense of taking or using the whole thing undivided.
全ぜん点てん
一部 means 'a part/some' of a set, directly contrasting with 全点's meaning of 'every single item/point' in that set.
全ぜん面めん
一部 means just a part or portion, the direct opposite of 全面's sense of covering the whole surface or extent.
全ぜん般ぱんN2
一部 means 'a part' of something, the direct opposite of 全般's sense of 'the whole' or 'entirety'.
全ぜん曲きょく
全曲 means every song or the whole piece, while 一部 means only a part or portion of it.
一いち面めんN2
一面 describes something covering the whole surface or area, whereas 一部 refers to just a portion or part of it.
全ぜん文ぶん
一部 means only a part or portion of something, while 全文 refers to the entire text with nothing omitted.
全ぜん編ぺん
全編 means the entire work from start to finish, while 一部 refers to just a portion or excerpt of it.
全ぜん量りょう
一部 means 'a part/portion' of something, directly contrasting with 全量's meaning of 'the whole amount'.
全ぜん域いきN1
一部 means 'a part' or 'a portion' of something, the direct opposite of 全域, which means 'the entire area or field'.
全ぜん社しゃ
全社 refers to the entire company acting together, whereas 一部 refers to only a part or section of it.

一いち分ぶ
一分 (いちぶ) denotes a fraction like one tenth or one percent, while the homophone 一部 (いちぶ) means 'a part' or 'one copy' of something, an unrelated sense.

一いち部ぶUsage100%
Standard kanji spelling; high-frequency in news and general use.
１いち部ぶ
Numeric variant sometimes seen in lists or headings; less common in running text.

Compound of 一 (one) and 部 (part, section, copy). The reading いちぶ follows standard on'yomi.