Depending on the dialect, vowels may be matter to numerous mergers in advance of /l/, so that e.g. fill /ˈfileɪl/ and experience /ˈfiːl/ or pull /ˈpʊl/ and pool /ˈpuːl/ might not be distinguished. For more extensive info on dialect variations, you might need to begin to see the IPA chart https://cesarjxrtg.eedblog.com/32302402/the-smart-trick-of-hack-that-nobody-is-discussing