13 possible answers to
Answers with 4 characters: HARK HEED MIND NOTE TEND Answers with 5 characters: SITUP Answers with 6 characters: LISTEN TUNEIN Answers with 7 characters: HEARKEN Answers with 8 characters: TAKEHEED TAKENOTE Answers with 9 characters: LENDANEAR Answers with 10 characters: TAKENOTICE