Linguistically: Somalis belong to different sub-sub-sub-family langugage of the big Afro-Asiatic family.
Egyptian language has its own sub family language. LOOK AT THIS
1- Simple one
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See how the Eyptian has its own branch? It had evolved from Arachaic Egyptian to early-middle-late-medival-coptic. All these happened through thousands of years.
Next the more diteiled.
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You can see how long and how our language to evolved to its stage. From proto-cushitic to modern Somali.
Although that pic don't show the evolotion of the egyptian, here this.
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This shows how much the two languages differ from each other, and evolved separately from one other, which is a huge differences. Don't you think?