Changing words does make sense at times but not always like when it comes to your own name, address, phone number, and etc. If you wanna be more articulate then you should learn speech techniques or you can afford time and money go for speech therapies conducted by skillful and experienced speech therapists. BTW you can try metronome therapy: Download a metronome app and practice reading materials following to the pace of it. The steady regimen of metronome is about 15 mins per day, 5 days per week and after 8 weeks you are likely to witness the effectivenesses, and remember that pace should increase from 90 bpm to 120 bpm gradually along the process. Hope that can help u a lot