Mrz
"For spelling, it's a matter of memorising words by word" all 250000 of them masha?
That figure of 250,000 includes derivatives, such as 'works, workings, worker' from 'work' and thousands of foreign words which are listed in dictionaries but most people either don't know or never use (posada, Leitmotif, raconteur, racemose).
I have established that the core English vocabulary, i.e. the main words which most pupils can be expected to become familiar with by age 16, consists of no more than 7,000 words. Even that alredy includes some relatively little used ones like 'heifer, sleuce' and 'pommel'.
Of those, 3,695 contain one or more unpredictable letters, such as 'frIend, bUild, imaginE'.
English spelling is not completely chaotic, and children grasp the basic rules easily enough, as their sensible early spellings invariably show (frend, bild, imajin/imagin). But learing to spell such simple, common words in the unpredictable, unphonemic ways which have become enshrined in dictionaries takes many years, because there is no ways of learning to spell them 'correctly', except memorise their little quirks word by word.