[kingosticks]

Do you have a reference for that? I'm genuinely curious since both terms are used in literature.

[omgtehlion]

"combinatorial" was used predominantly in 1970s books for whatever reason.

In most of contemporary books and university courses "combinational" is used and with a note that you should not confuse it with "combinatorics" and "combinatory logic"

[jonsen]

“An alternate term is combinatorial logic,[2] though this usage may be considered controversial.[3]”:

https://en.m.wikipedia.org/wiki/Combinational_logic