kombini

To combine: to put two or more things together so that they work as one. Transitive, and it takes kun or en for what you are joining to what: kombini teorion kun praktiko. The noun kombino is the act, kombinaĵo the resulting mixture, and kombina the adjective.

Here is the gift of the word, and it is a good one. Kombini is notkomb- plus -in-. Esperanto really does have a verb kombi, to comb, and it really does have the suffix -in- that makes a word feminine. Put them together honestly and kombino would mean a lady doing something with a comb. It does not. Kombin- is a single borrowed root, imported whole from the international vocabulary, and the -in- you can see in the middle of it is an accident of Latin spelling rather than a piece of Esperanto grammar. Combining is not a woman combing.

Why the trap works, and where else it lies in wait. Esperanto's affixes are so productive that a learner is trained to look for them, which is exactly what makes the false seams dangerous. Procento looks like po plus cento and is not. Inspiri looks like in- plus a root and is not. Impliki, in this same chapter, looks like it contains the technical suffix -ik- and does not. The rule of thumb: if the word came in from international vocabulary, assume it is one root until a dictionary tells you otherwise. If you want the genuinely built word for mixing things, miksi is at rank 1515 and has no such history.