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Common words appear frequently in written and spoken language across many genres from radio to academic journals.
Informal words should be reserved for casual, colloquial communication.
noun boundary; frontier

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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noun early childhood; origins

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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adj rudimentary

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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noun prominence

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adj developing

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adj earliest

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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noun introduction

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noun original production

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noun preface

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noun origin

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noun babyhood

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noun prominence

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noun starting point
noun starting

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noun fountain

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noun origin

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verb come into being; proceed

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verb happen, emerge

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verb open, pierce

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verb initiate, found

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verb appear, enter

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verb start

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verb embark on; take part in