The Kanji of Metaphor

For some reason, the various variants of the Kanji for metaphor (喩) caught my eye.

比喩 (Compare-Metaphor): Metaphor
暗喩 (Dark/Obscured-Metaphor): Metaphor
隠喩(Hidden-Metaphor): Metaphor
引喩 (Pull-Metaphor): Allusion
直喩 (Honest/Straight/Frank-Metaphor): Simile
風諭 (Style/Wind/Air-Metaphor): Insinuation, hint, allegory
諷喩 (Hint-Metaphor): Insinuation, hint allegory
換喩(Interchanging-Metaphor): Metonymy