• hw,
• ez,
• hx,
• xyz,
• hk,
• hy,
• chx,
• hetz,
• haz,
• dz,
• iz,
• nz,
• sz,
• cz,
• hv,
• hs,
• hd,
• bz,
• hc,
• hh

• ha,
• h's,
• hi,
• Z,
• Ht.,
• hg,
• az,
• H,
• he,
• oz..

The adjective form of "hz" is "hertzian".

The plural form of "hz" is "hz" as it stands for hertz, a unit of frequency. The abbreviation does not change in its plural form.

The singular form of the word "hz" is "hz". Hz is actually an abbreviation for hertz, which is the standard unit of frequency in the International System of Units (SI). The abbreviation does not change in its singular form.