word-spacing is probably what you're looking for.
Example from w3schools.com:
.a {
word-spacing: normal;
}
.b {
word-spacing: 30px;
}
.c {
word-spacing: 1cm;
}<h1>The word-spacing Property</h1>
<h2>word-spacing: normal:</h2>
<p class="a">This is some text. This is some text.</p>
<h2>word-spacing: 30px:</h2>
<p class="b">This is some text. This is some text.</p>
<h2>word-spacing: 1cm:</h2>
<p class="c">This is some text. This is some text.</p>
Didn't even know that this property exists.