One word to describe "On the left" or "On the right" like in Above and Below

As in the title, It would be handy if there were equivalents of Above and Below for 'On the left' and 'On the right', I'm wondering why there aren't ?

Above, below, behind, before, aright, aleft:
aright, aleft are almost exclusively literary, not found in general writing, at least not anymore.

Aright, aleft

"Aright, aleft, above, below,
Rushing ravenous to and fro,
The sharks with their cold blue wolfish eyes,
Dashed, as I passed, at the sinking prize,
… (p.21)"

And

"The gallant ship has made the bay
Through tempest, storm and night,
'Mid foam and spray she holds her way,
With shoals aleft, aright;
Behind, before, the breakers roar,
And the boiling seas are white;
… (p.47)"

(J. Briggs, Beacon, in "Contributions to the Pen and Pencil Club," GoogleBooks.

See also:

How swift the flood, the mead, the wood,
Aright, aleft, are gone.
The bridges thunder as they pass,
But earthlie sowne is none.

(Gottfried August Bürger, "Lenore," From archive.org)