How do you put a long straight line between two words ie longer than -
Do you mean to replace the space between words by a continuous line (called a leader line)? In this case, edit your question to tell how your words are spaced: standard space, optionally enlarged by justification, or resulting from a tab?
In the second case, various lines may be automatically substituted for the tab character.
.
- Write
--and it will be substituted
by–(Auto Correct). - Insert special en or em dashes by
inserting special characters (menu Insert or icon in standard bar) - Define a shortcut for any dash in
Auto Correct function or Auto Text
function - Write the U+hexadecimal value and hit ALT-X, for example U+2013 (en dash) or U+2014 (em dash); test with other character and only hit ALT-X anywhere in given text
From Em dash | The Punctuation Guide
Do not mistake the em dash (—) for the slightly narrower en dash (–) or the even narrower hyphen (-).
Be aware that your font contains characters like the above mentioned; there could also be some similar (minus sign, box drawings horizontal, horizontal bar)…
In Writer, you have the following predefined substitutions:
:-: → minus sign
:--: → en-dash
:---: → em-dash
All those autocorrect substitutions apply immediately as soon as you type the second colon. You can create your own “immediate substitutions” on Tools → AutoCorrect → AutoCorrect Options.