Hi BrightonMama:
I'm going to post you a link - I am not saying your son has this or labelling him - I'm saying that learning disorders are on a spectrum and a lot of what you are saying rings bells (DH is severely dyslexic and what you describe fits the kind of symptoms young dyslexic children exhibit):
www.dyslexia.com/library/symptoms.htm
Being labelled with a learning disorder can seem really scary but the point is there are a slew of incredibly talented people with dyslexia:
www.bdadyslexia.org.uk/about-dyslexia/famous-dyslexics.html
Being slow to speak
Having a more limited vocabulary
avoiding reading (but having good auditory skills of recall)
are all classic signs.
lack of coordination - inability to catch a ball for example - is another.
==========
Things to try and discuss
Ask your DC what happens to letters when he looks at them...
do they seem to jump or wiggle?
Do they appear all mixed up?
Ask him to spell out a word - c-a-t or a sequence of numbers 1-2-3-4-5 from a written piece of text. If he can't - there's a problem there.
===================
Now with DH as a very small child he absolutely would not accept that c-a-t was cat. It didn't look anything like a cat (fuzzy animal with pointy ears, long tail and whiskers). He didn't get phonetic sounds (they were also taught by flashcard which was an absolute disaster for him).
He did learn to read. At 13. He's been reading voraciously ever since.
Puberty often makes a huge difference for dyslexics. Major improvements can happen then - so often they are seen as late starters.
A friend's daughter found out in Y7 that viewing written text through a coloured filter or coloured lenses (she now has special glasses) made a huge improvement.
So my advice is don't fear having your child diagnosed/ tested at this young age. It's an attempt at getting to the bottom of whatever issue there is and learning how to adjust for it so he can progress and join in.
Also if diagnosed with a learning disability this can mean that he is given additional time to read (because processing speed is slower) and write (again because writing can be difficult) answers in formal testing (like SATs). This isn't giving him an advantage - it's making the playing field level.
My DH read somewhere that a dyslexic works 1/3 again as hard as a 'normal' just going through a day. If your son seems worn out by the end of the school day, if keeping up is a real effort, if he relies on his memory of what was said in class rather than what he has read/ done himself - these all point to someone with dyslexia.
There are severe to mild dyslexics - but it is possible to cope and play to your strengths.
My DH was labelled a dunce and made to wear the cap when a little boy in school (in England). DH is a University Lecturer now - his strength is a photographic memory which he utilizes in his work (pattern recognition). He has this ability precisely because he is dyslexic. He'll never be able to sort out which there/ their or they're he should use (he uses them interchangeably - no amount of my telling him the difference gets through and he can't multiply/ divide for toffee) but he's considered an expert at what he does.
HTH