いわば・言わば・謂わばiwaba[1]atamadaka (head-high)

1. adverbso to speak; so to call it; as it were
   その画家がかは、いわば永遠えいえんの少年しょうねんだ。↗

   The artist is eternally a boy.

• Synonym言うなればいうなればNeutralPutting it another way, as in 「言うなれば彼は天才だ」. Almost synonymous with 「言わば」, but slightly more colloquial.
• RelatedいわゆるNeutralPre-noun word meaning 'so-called', as in 「いわゆる天才」. Common in both speech and writing; it cites what people generally call something rather than drawing a comparison.

For 'so to speak' — drawing a comparison — 「言わば」 is the default. Use 「言うなれば」 when putting things another way, and 「いわゆる」 when citing what people generally call something.

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

1. 言いってみれば。例たとえていうなら。