You gotta pay by the hour to make a hormone.

Alternate explanation:

Hormone: Pretty much any chemical your body uses for intra-body signaling. Signaling in this case can be anything from dumping adrenaline in order to move blood preferentially to the muscles, to the production of estrogen in order to promote cell growth in certain organs.

Steroid: A particular class of compounds grouped by the existence of a particular quartet of carbon atom rings inside each of the molecular structures. They have a very wide range of roles across the tree of life. Examples include, but are not limited to: testosterone, cholesterol, ergosterol, and progesterone.

Steroid (colloquial meaning): Pretty much any performance enhancing drug, including hormones and actual steroids.

In this case, nothing. High dose testosterone is a hormone, hgh is a hormone. Both are PEDs (performance enhancing drugs). Now, the difference between them is a bit more interesting.

Testosterone, the original steroid, makes you big by maximizing your existing muscles (super paraphrased, as is everything I'm about to say). It's the one that gives you breasts and shrinks your balls (for those that have them).

Human growth hormone makes you big by inducing the creation of new muscle. As well as everything else. The stand outs being the heart, which you really don't want to grow, and the intestines, which gave bodybuilders roidgut.

Like I said, very paraphrased, but that's the gist of it. And doesn't touch more advanced things like tren.

No difference at all if you’re Elon musk and you take that shit but don’t bother to actually work out