Learn English – Difference between “except” and “besides”

"Raise" when used as a verb is transitive: it requires that you have a direct object, a noun of some kind that you are applying the verb to. For example, "I must raise an objection"—"an objection" is the object that the subject (I) is using the verb to act upon.

"Rise" on the other hand, is an intransitive verb: it does not require a direct object; your sentence can be complete without one. "Please rise" is entirely correct and complete.

The OED gives the following definitions of reliable and dependable:

Reliable—1. That may be relied on.

1a. Of a person, information, etc.: able to be trusted; in which reliance or confidence may be placed; trustworthy, safe, sure.

1b. orig. U.S. Of a product, service, etc.: consistently good in quality or performance; dependable.

Dependable—That may be depended on; trustworthy, reliable.

Both definitions list the other word in their definitions, with no special qualifiers attached. In addition, both words use the word trustworthy, also without qualifiers. Therefore, it is safe to say that the two are synonyms and may be equally used.