Synonyms for Paying Attention (same or very similar meaning)
WordNet sense 1 (paying particular notice (as to children or helpless people)):
attentiveness, heed, regardWordNet sense 2 (taking heed; giving close and thoughtful attention):
attentive, heedful, thoughtfulWordNet sense 3 (in an attentive manner):
attentively, with attentionFrom the ODE community, based on WordNetadd/edit