同様|どうようdouyou[0]heiban (flat)

1. no-adjective, na-adjective, noun (suffix)same; similar; (just) like; equal
   この車くるまは新車しんしゃ同様どうようだ。↗

   This car is like new.

• Synonym同じおなじNeutralThe everyday default for 'same'; 「同様」 is more formal and written in tone, and often means 'similar' or 'likewise' rather than strictly identical.
• Synonym同じくおなじくWrittenA written-style adverb or conjunction meaning 'likewise', often used when listing items, as in 「同じく〜も」.
• SynonymイコールNeutralA loanword meaning 'equals' or the equals sign, also 'identical to', as in 「AイコールB」.
• Synonym等しいひとしいNeutralAn adjective meaning equal, or no different from, as in 「無いに等しい」 (as good as nothing).
• Synonym同然どうぜんNeutralMeans 'as good as, virtually the same as', often in metaphor, as in 「死んだも同然」.
• Synonym同じようおなじようNeutralMeans roughly the same or similar and is common in speech; 「同様」 is the more formal choice.
• Synonym等しくひとしくWrittenA written adverb meaning 'equally, impartially', as in 「等しく分配する」; it stresses fairness rather than mere similarity.
• Synonym同様にどうようにNeutralThe adverbial form of 「同様」, meaning 'in the same way', as in 「同様に扱う」.
• Related同一どういつWrittenMeans exactly the same, one and the same, as in 「同一人物」; 「同様」 can also mean merely similar, without requiring identity.
• Related同等どうとうNeutralRefers to equal degree or rank, as in 「同等の権利」; it focuses on level or status rather than general similarity.
• Related均等きんとうNeutralDescribes even, equal distribution or opportunity, as in 「機会均等」; it is about proportion, not resemblance.
• Related等価とうかWrittenMeans equal in value, or logical equivalence, as in 「等価交換」; 「同様」 broadly covers similar situations.
• Related共通きょうつうNeutralMeans shared or common to several things, as in 「共通点」; 「同様」 says things are alike with each other.
• Related均質きんしつWrittenDescribes uniform quality throughout, as in 「均質な素材」; it focuses on texture or quality, not overall likeness.
• Related均一きんいつNeutralMeans uniform in quantity or degree, as in 「百円均一」; it is about evenness, not resemblance.
• Related同質どうしつWrittenMeans the same quality or nature; a written-style word.
• Related類同るいどうWrittenA rare written word for 'of the same kind'; in normal use prefer 「同様」 or 「似ている」.
• Related同質的どうしつてきWrittenMeans homogeneous in nature; a written, analytical term seen mostly in sociological discussion.
• Related等質とうしつWrittenA rare academic term for equal or uniform quality, little used outside scholarly writing.
• Related負けず劣らずまけずおとらずNeutralAn idiom meaning 'no less than, just as good as', as in 「兄に負けず劣らず優秀だ」; it compares ability.
• Antonym別様べつようWrittenThe antonym: a different way or manner, the opposite of 「同様」; rare and written in style.

Use 「同様」 for 'same' or 'likewise' in formal, written contexts. In everyday speech prefer 「同じ」 or 「同じよう」. For exact identity use 「同一」, for equal rank or degree 「同等」, and for 'as good as' comparisons 「同然」. The adverb is 「同様に」; 「同じく」 lists items in formal prose. Words like 「均等」「均一」「等しい」「イコール」 deal with equality of amount, value or level rather than similarity.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 同おなじであること。ほとんど同おなじであること。またその様よう。