It does not appear to be a monophyletic group, and no single character unites all the members.
ɪ t WORD_BOUNDARY d ʌ z n ɑ t WORD_BOUNDARY ʌ p ɪ ɹ WORD_BOUNDARY t ə b i WORD_BOUNDARY ʌ WORD_BOUNDARY m ɑ n oʊ f aɪ l ɛ t ɪ k WORD_BOUNDARY ɡ ɹ uː p WORD_BOUNDARY æ n d WORD_BOUNDARY n oʊ WORD_BOUNDARY s ɪ ŋ ɡ ə l WORD_BOUNDARY k æ ɹ ɪ k t ə ɹ WORD_BOUNDARY j uː n aɪ t s WORD_BOUNDARY ɔ l WORD_BOUNDARY ð ə WORD_BOUNDARY m ɛ m b ə ɹ z WORD_BOUNDARY