I've found a word that can be created by picking a letter from a standard telephone dialing keyboard, moving from one lettered button to its neighbor (vertical, horizontal or diagonal), covering distinct buttons, no repetitions.

This word consists of 8 letters, since neither 0 nor 1 are used for letters; # and * are also ignored.

2 represents ABC, 3 DEF, 4 GHI, 5 JKL, 6 MNO, 7 PQRS, 8 TUV and 9 WXYZ .

a. Please find my word or others (if any), that comply.
b. Allowing repetition what is the longest English word found by you?