"speech" or "words" radical in Chinese characters (Kangxi radical 149) / see also 言字旁[yan2 zi4 pang2]
Mnemonic symbol: this character looks like a big "i" (like in information), and I'll represent it by an advertising column. Maud Younger (y) gives a speech (讠) standing on top of an advertising column (讠) in the anthill's kitchen (an2).
Characters with 说 as component
is not used as a component in another character.
lit. family members speak frankly with one another, not courteously, as if they were from two different families (idiom) / fig. people don't need to be deferential when they ask a family member for help / people from the same family should stick together (and good friends likewise)