百科|ひゃっかhyakka[1]atamadaka (head-high)

1. nounmany objects (for study)
2. nounencyclopedia; encyclopaedia

• Related百科全書ひゃっかぜんしょWrittenMore written than 「百科事典」. Covers encyclopedias in any form, including CD-ROMs and websites, and can specifically mean the French Encyclopédie of Diderot and d'Alembert.
• Related百科事典ひゃっかじてんNeutralThe most common everyday word for an encyclopedia. 「百科」 alone can also mean the various fields of study, a more written usage.
• Related百科辞書ひゃっかじしょWrittenA written synonym of 「百科事典」 for an encyclopedia, used less often. 「百科」 alone refers to the various fields of study or to an encyclopedia.
• RelatedエンサイクロペディアNeutralA loanword for encyclopedia, often seen in book titles. In everyday speech 「百科事典」 is the usual word.

Everyday speech uses 「百科事典」. 「百科全書」 is more written; it can mean encyclopedias generally or the historic French work. 「エンサイクロペディア」 appears mostly in titles. 「百科」 alone means all fields of study or an encyclopedia, often the first element in compounds.

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

1. あらゆる科目かもく・学科がっか。