支柱|しちゅうshichuu[0]heiban (flat)

1. nounprop; stay; support; brace; fulcrum

• Synonym突っ張りつっぱりNeutralA pole or bar braced to keep something from toppling; also tautness, stiffness, or a sumo open-hand push. 「支柱」 is the supporting pillar itself or a figurative mainstay.
• Synonym大黒柱だいこくばしらNeutralOriginally the central pillar of a house; now mostly a family's breadwinner or a team's core figure. 「支柱」 is figurative too but not limited to people.
• Synonym屋台骨やたいぼねNeutralThe beam-and-pillar framework of a house; figuratively the finances and core people that keep a family or organization going, as in 「屋台骨が揺らぐ」.
• SynonymつっかいCasualColloquial term for a stick propped underneath to keep something from toppling; usually said as 「つっかい棒」. Unlike 「支柱」, no figurative use for emotional support.
• Synonym支えささえNeutralNative word for support or something to rely on — physical, financial, or emotional, as in 「心の支え」. 「支柱」 is the more literary term, mostly a pillar or central mainstay.
• Synonymつっかい棒つっかいぼうNeutralGeneral term for a stick or timber propped underneath to stop an object toppling or shifting; the focus is on the concrete prop. 「支柱」 also works as a figurative mainstay.
• Related幹みきNeutralOriginally a tree trunk; figuratively the trunk or core of a thing — the central part itself, not a support bracing from the side.
• Related中枢ちゅうすうNeutralThe vital center of something, as in 「神経中枢」 or 「政治の中枢」; stresses control and command, not physical support.
• Related土台どだいNeutralThe foundation at the very bottom of a building, bearing the weight from below; also an adverb meaning 'fundamentally, from the outset' — a use 「支柱」 lacks.
• RelatedかなめNeutralThe most crucial part or person, as in 「チームの要」; stresses being the key element, without the nuance of holding something up.
• Related基幹きかんWrittenFormal written word for the parts that form the base or core, as in 「基幹産業」; never an actual pillar, unlike 「支柱」.
• RelatedバックボーンNeutralLoanword for spiritual backbone or a central supporting force, and for a network's backbone lines. 「支柱」 can also mean a physical pillar.
• Related拠り所よりどころNeutralSomething to rely on — grounds for belief or an emotional anchor; it stresses what one leans on rather than a load-bearing structure. 「支柱」 can be an actual pillar.
• Related主柱しゅちゅうWrittenWritten word for a building's main load-bearing pillar or, figuratively, an organization's center; rare. Everyday figurative use favors 「支柱」 or 「大黒柱」.
• RelatedキーストーンNeutralLoanword for the stone that locks an arch together, hence the crucial point; in baseball, the shortstop–second-base duo. Everyday figurative use favors 「要」.

Use 「支柱」 for a pillar that physically holds something up or, figuratively, for a spiritual or economic mainstay. For a family's breadwinner say 「大黒柱」, for emotional support 「支え」, for a physical brace 「つっかい棒」, and for the crucial element 「要」.

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

1. 支ささえるための柱はしら。
2. 支ささえとなる重要じゅうような存在そんざい。