Flemish steel […] some in bars and some in gads.

The spanner for spanning or winding up the spring of the wheel lock.

Rocks, dens, and caves! But I in none of these / Find place or refuge.

As stated above, compound words are formed by joining two words into one word. Some compound words retain elements of the meanings of the two words. Examples include sunlight, flagpole, flying fish, and bridge-builder.