It originates in Homer Iliad 7.219:
Αἴας δ᾽ ἐγγύθεν ἦλθε φέρων σάκος ἠΰτε πύργον:And Ajax came close, carrying a shield like a tower:
In typically Homeric fashion, the line recurs verbatim a couple of times, at 11.485 & 17.128. Translation is mine for the nonce. The link is to the Perseus Project. Both English translations available there, Butler 1898 ...
According to the opening of the guidelines, you should use COVID-19 to refer to the disease, and SARS-CoV-2 to refer to the virus. In a formal paper I would establish these terms at the beginning. I would not expect readers of a formal paper to be confused between the 2003 SARS and the new disease.
I can do no better than commend Merriam Webster to you. I started there with one of my favourites - "hackneyed" - and discovered several old friends:
"Choose the Right Synonym for hackneyed - TRITE, HACKNEYED, STEREOTYPED, THREADBARE mean lacking the freshness that evokes attention or interest.
TRITE applies to a once effective phrase or idea ...
'Electronic Tag' is the official nomenclature.
Electronic Tags - Electronic monitoring (known as ‘tagging’) is used in England and Wales to monitor curfews and conditions of a court or prison order.
I have heard the word 'bracelet' being used colloquially, but this causes confusion with the other slang meaning of 'bracelet'.
One of the definitions given by Oxford Dictionaries is 'make a sound of a specified kind'. This is a common usage in informal speech and when teaching animal noises to children:
The cow goes moo.
The balloon went bang.
Though not really a word, serde (serialization + deserialization) is composed in pretty much the same manner as coder + decoder.
Several libraries use this name:
The Dictionary of Wordplay by Dave Morice (2001, Teachers & Writers Collaborative) defines the term "word-unit palindrome" as you noted in the question. He also states that this type of palindrome is called a "pseudodrome."
While this may not be the right causal explanation, there could be a functional benefit to the asymmetry. "Benign" and "malignant" are technical terms, not widely known; and they are opposites. Making them less similar helps reduce the risk of miscommunication and misunderstanding.
(c.f. The Design of Everyday Things on how aesthetic ...