Semantic Puns and Alternative Hanzi There seems to be a set of Chinese words that have alternatives (disregarding the traditional/simplified split). For example, 借 and 藉. Within this class of alternatives, however, seems to be a set of semantic puns. Consider, for example:


  (1) 蘇 (/su1/ 'revive') ＝ 更生('live again') → 甦 (/su1/ 'revive')
  (2) 天 (/tian1/ 'sky') ＝ 青色的空氣('blue air') → 靝 (/tian1/ 'heaven')


My question: is there a special term for these kinds of alternatives? Ultimately, I'd like to be able to find other such pairs.

NB1: I'm aware that the alternative in (2) is restricted to a Taoist context.
NB2: I'm also aware of alternatives like 妝 and 粧, but from what I can tell, this specific pair seems to have gone the other way -- the semantic 妝 was later supplanted by the phono-semantic 粧.
According to 六書 
(http://en.wikipedia.org/wiki/Chinese_character_classification)

There are two kinds of this
1. 轉注：
Basically this mean the multiple characters may map in the same mapping if 
1) They are in same radical (category).
2) They sound similar 
Example: 老 (old) 考 (Originally meant old; deconstructed as 耂 derivative (老字头) of 老 lǎo "old" + 丂 qiǎo (phonetic). Later evolved to mean "deceased father". Modern meanings of to exam. (From http://en.wiktionary.org/wiki/%E8%80%83)


假借：
Basically this mean the a character is assigned to more than one senses.
Example: 蘇 (/su1/ 'revive') ＝ 更生('live again') → 甦
     云 (Originally Cloud, then become "say") →  雲 (Cloud)


Or you can search "通同字" or "通假字"