Does calling aspell give better results than matching against it's word-list dump?

When implementing a spell checker as an external process, I can call aspell directly, however this has the overhead of starting a process. An alternative solution is to dump all aspell words to a list, eg: aspell -d en_US dump master If I only need to know if the word is correctly spelled or not, and ignoring details about case sensitivity. Is there any difference between checking a word exists in the word-list, and calling aspell directly? ---- For example, if I'm writing software which includes a spell checker, would it be reasonable to load all words into a set data-structure, then check if the set contains a word - as an alternative to calling aspell.