Nonthreatening, nonfiction, nonfat. Or nondrinker or nonverbal.
Continuous, nonstarter, nonrefundable.
"Disapprove," "dishonor," and "disbelief" all have the same prefix "dis-" as "disagree" and "disrespect."
Words with the same prefix as decode:debriefdecomposedecreasedeductdefamedeflatedeformeddefusedefrauddegradedehydratedejecteddelousedemilitarizedemeritdemanddemarcationdenotedenouncedepressderailderangeddethronedetractdetaindevaluedevote
Words with the same prefix as mismatch:miscalculatemisconstruemiscountmiscuemisdiagnosemisfortunemisjudgemisleadmismanagemisplacemispronouncemisreadmisrepresentmisstatemisstepmistreat
Some words with the same prefix as "unicellular" include unicycle, uniform, and unitarian.
dodecahedron
"Disapprove," "dishonor," and "disbelief" all have the same prefix "dis-" as "disagree" and "disrespect."
Words with the same prefix as decode:debriefdecomposedecreasedeductdefamedeflatedeformeddefusedefrauddegradedehydratedejecteddelousedemilitarizedemeritdemanddemarcationdenotedenouncedepressderailderangeddethronedetractdetaindevaluedevote
Words with the same prefix as mismatch:miscalculatemisconstruemiscountmiscuemisdiagnosemisfortunemisjudgemisleadmismanagemisplacemispronouncemisreadmisrepresentmisstatemisstepmistreat
December
The scientific prefix for same is homo- and the prefix for different is hetero-, as in homozygous and heterozygous.
nonagonal nonagenarian
octahedra, octahedron, octameter, octave, octachord
Some words with the same prefix as "unicellular" include unicycle, uniform, and unitarian.
The word "octopus" shares the same prefix as "octagon," which is "octo-." This prefix means "eight" in reference to the number 8.
Some words with the same prefix as "hendecagon" include "hexagon" (six sides) and "octagon" (eight sides). These words have prefixes that indicate the number of sides in the geometric shape.
As a prefix, homo- means same. words: homogeneous, homonym, homosexual...
There are no words of that sort that do not have a prefix or suffix. Some such words include (from Wikipedia): "willless", "bulllike", "goddessship", "headmistressship".