Although it is a word characterized as a conjunction of concession used to relate opposing thoughts.
For grammar, the word while is used to introduce a subordinate clause that has a statement which contrasts with the statement identified in the main clause, but which has no argument to nullify this last.
Example:"Pedro didn't run for the math exam, as long as he could do it."
The conjunction originates from the joining of the prepositions with and how much. In sentence constructions, the word however can be replaced by synonyms like other concessive conjunctions like though, nevertheless, though, since, among others.
See also the meaning of conjunction and preposition.
however and for the
It is common to have some confusion in the use of conjunctions however and as in grammatical constructions. Even though they belong to the same grammatical class, they give different meanings to the sentences.
however it is a concessive conjunction, used to express the value of an opposing idea. The conjunction
for how much it is explanatory, which introduces a justification that has already been mentioned above.Example: "John ate a lot, for how much I was hungry". (explanation idea)
Example: "We received terrible public services, however let us pay a high tax burden". (opposition idea)
See too: Examples of the use of notwithstanding and its meaning.