Synonyms:

burden, charge, encumbrance, incubus, pack,
cargo, clog, freight, lading, weight.

A _burden_ (from the Anglo-Saxon _byrthen_, from the verb _beran_, bear)
is what one has to bear, and the word is used always of that which is
borne by a living agent. A _load_ (from the Anglo-Saxon _l[=a]d_, a
way, course, carrying, or carriage) is what is laid upon a person,
animal, or vehicle for conveyance, or what is customarily so imposed;
as, a two-horse _load_. _Weight_ measures the pressure due to gravity;
the same _weight_ that one finds a moderate _load_ when in his full
strength becomes a heavy _burden_ in weariness or weakness. A ship's
_load_ is called distinctively a _cargo_, or it may be known as
_freight_ or _lading_. _Freight_ denotes merchandise in or for
transportation and is used largely of transportation or of merchandise
transported by rail, which is, in commercial language, said to be
"shipped." A _load_ to be fastened upon a horse or mule is called a
_pack_, and the animal is known as a pack-horse or pack-mule.

* * * * *

LOCK.

Synonyms:

bar, catch, fastening, hook,
bolt, clasp, hasp, latch.

A _bar_ is a piece of wood or metal, usually of considerable size, by
which an opening is obstructed, a door held fast, etc. A _bar_ may be
movable or permanent; a _bolt_ is a movable rod or pin of metal, sliding
in a socket and adapted for securing a door or window. A _lock_ is an
arrangement by which an enclosed _bolt_ is shot forward or backward by a
key, or other device; the _bolt_ is the essential part of the _lock_. A
_latch_ or _catch_ is an accessible _fastening_ designed to be easily
movable, and simply to secure against accidental opening of the door,
cover, etc. A _hasp_ is a metallic strap that fits over a staple,
calculated to be secured by a padlock; a simple _hook_ that fits into a
staple is also called a _hasp_. A _clasp_ is a fastening that can be
sprung into place, to draw and hold the parts of some enclosing object
firmly together, as the _clasp_ of a book.

* * * * *

LOOK.

Synonyms:

behold, discern, inspect, see, view,
contemplate, gaze, regard, stare, watch.
descry, glance, scan, survey,

To _see_ is simply to become conscious of an object of vision; to _look_
is to make a conscious and direct endeavor to _see_. To _behold_ is to
fix t