The context for this question is word games like Scrabble, but it seems like it might also have minor applications elsewhere. If I played "book" and "solid" we could say that S and D have this quality, because they are used in the same word, but S and K do not, because they are used in different words.

Stuck in my head is "co-literal", but I'm fairly certain it's a neologism.

  • You might be able to refer to them as co-linear (normally a math term referring to points that are "lying along the same [straight] line").... – Hellion Oct 20 '18 at 18:47

Perhaps "common". In your example, S and D are common to solid but not book. S and K are not common to either word.

From https://www.google.com/search?q=common+definition:

shared by, coming from, or done by more than one.
"the two republics'common border"

belonging to, open to, or affecting the whole of a community or the public.
"common land"
synonyms: collective, communal, community, public, popular, general; shared, combined
"the common good"
antonyms: individual, private

belonging to two or more quantities.

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