Among the 300 most used English words, 190 are perfectly decodable, although some of tricky ones (there, where, were) undermine some of them (even, these, here).
In the first 100 most HF words, 42 are not entirely decodable:
the, he, be, we, me, she,
of, to, was, want, all, call, one, said,
you, by, my, only, come, could, do, down, into, look, now, other, right, some, there, two, when, what, where, which, who, why, your,
are, have, before, more, were,
In next 200, 55 are clearly tricky:
another, any, many, saw, water, small, laughed,
bear, great, head, ready,
ever, never, every, eyes,
find, friends, giant, I?ll, I?m, key, live, river,
people, pulled, put, thought, through, were, work, would,
coming, everyone, gone,
most, mother, oh, once,
grow, how, know, snow, town, window,
book, food, good, room, school, soon, too, took, door,
Mr Mrs
Another 13 are slightly so (partly depending on accent):
after, asked, can?t, fast, last, plants
animals, dragon, magic,
clothes, cold, old, told
The other 190 are regular for reading (but many, such as 'they' not for spelling) and can all be used for teaching decoding:
a, am, an, and, as, at, back, bad, can, cat, dad, gran, grandad, had, has, hat, man, rabbit, ran, sat, than, that, that?s,
came, gave, made, make, place, take, same, name, baby,
away, day, may, play, say, way,
car, dark, garden, hard, park,
bed, best, better, eggs, end, fell, get, help, let, let?s, next, red, tell, them, then, very, well, went, yes, her,
been, feet, green, keep, need, queen, see, sleep, three, tree, trees,
each, eat, sea, tea, please, even, here, these,
big, children, did, didn?t, different, fish, him, his, if, in, is, it, it?s, its, king, little, miss, still, thing, things, think, this, will, wind, wish, with,
birds, first, girl,
inside, like, liked, time, I, I?ve, cried, night, right, by, fly, my,
box, dog, fox, from, got, hot, long, lots, no, not, of, off, on, so, stop, stopped, top, floppy, across, along,
cold, old, told,
go, going, home, over, clothes,
or, for, horse, morning,
found, house, mouse, our, out, round, around, shouted, about, boy,
but, duck, fun, just, much, mum, must, run, sun, under, up, us, jumped, suddenly,
use,
their, they, new, again, air, because, began, boat, window.