Riddle: What starts with an E, ends with an E, but only…

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what-has-keys-but-cant-open-locks-space-but-not-outer

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what-solitary-letter-holds-you-back-yet-without-it-you

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i-hold-two-meanings-one-said-and-one-done-im-spotted-in

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im-a-word-of-letters-three-add-two-and-fewer-there-will-be-what-am-i

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i-am-an-unseen-architect-building-bridges-with-no-bricks-connecting-minds-with-i