Intralingual behavior is behavior in the usual sense: moving pronunciation organs, uttering speech, and arranging them into qualified words and sentences according to rules.
In-word behavior is the usual sense of behavior: moving the sound organs, issuing the voice, and arranging them by the rules into qualified words, sentences.
Intralingual behavior is a kind of behavior in the common sense: moving the speech organs, making sounds, and arranging them into qualified words and sentences according to the rules.