They all develop language at different stages. My DD can say those words you are mentioning...her trouble is words like disappear..it's pisappear She will be 4 in November.
She talks alot as well. She also over exaggerates her 'g' sound so she will say long with the 'g' sounding like it would in log.

She may say something incorrectly and rather tell her you say it like this, I usually say "oh, yes it did disappear". So just repeat in the correct context rather correct her directly. Seems to work on most occassions.

It will sort itself it out I would say.