tenten

As a noun tenten

is a diacritic (゛) used with Japanese kana to mark a consonant as voiced.

As a verb tented is

past tense of tent.

As an adjective tented is

covered with tents.

As nouns the difference between tenter and tenten

is that tenter is a framework upon which cloth is stretched and dried while tenten is (linguistics|colloquial) a diacritic () used with japanese kana to mark a consonant as voiced.

As a verb tenter

is to stretch cloth on such a framework.