primer, primmer

The words primer, primmer sound the same but have different meanings and spellings. Why do primer, primmer sound the same even though they are completely different words?

The answer is simple: primer, primmer are homophones of the English language.

primer
  1. :: noun

    the first or preliminary coat of paint or size applied to a surface

  2. :: noun

    an introductory textbook

  3. :: noun

    any igniter that is used to initiate the burning of a propellant

  4. :: noun

    A <xref>device</xref> used to circulate <xref>gasoline</xref> into the ignition chamber of an engine.

primmer
  1. :: adjective

    <xref>comparative</xref> form of <xref>prim</xref>: more <xref>prim</xref>

Definitions from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved., from Wiktionary, Creative Commons Attribution/Share-Alike License. and Wordnik.

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About Homophones

Homophones (literally "same sound") are usually defined as words that share the same pronunciation, regardless of how they are spelled.

If they are spelled the same then they are also homographs (and homonyms); if they are spelled differently then they are also heterographs (literally "different writing").