Usually between two consecutive vowels a consonant ~y (glide) sound slightly is said; e.g., for "chaos" ~kaeyaas or "create" ~kreeyyaet. (in ~truespel) But this can be silent as well so an apostrophe or double apostrophe is used; e.g., ~kae'aas ~kree"aet. In the truespel converter the y-glide version is shown. See analysis at https://justpaste.it/yglides showing that about 1% of the words on a page have consecutive vowels, thus y-glides. These 127 words out of 5k s are listed. For tutorials and converter see http://truespel.com . Truespel is free.
Of all the vowel sounds of US English, the "short a" is the one most consistently spelled. When you hear a "short a" vowel sound it is spelled by the single letter "a" 94% of the time in running text.
see analysis at https://screencast-o-matic.com/watch/cq6Y0FupeG